Cross-site request forgery in OPNsense - CVE-2026-30868
Published: April 9, 2026
Vulnerability identifier: #VU125578
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:A/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-30868
CWE-ID: CWE-352
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Deciso
Affected software:
OPNsense
OPNsense
Detailed vulnerability description
The vulnerability allows a remote user to cause unauthorized system state changes.
The vulnerability exists due to cross-site request forgery in state-changing MVC API endpoints when handling authenticated HTTP GET requests without CSRF validation. A remote user can trick a victim into visiting a malicious website to cause unauthorized system state changes.
User interaction is required, and exploitation relies on cross-site top-level navigation GET requests including the session cookie because it is configured with SameSite=Lax.
How to mitigate CVE-2026-30868
Install security update from vendor's website.